Definition of "enneahedron" in English

noun

1. (geometry) A polyhedron with nine faces.

   • 1996, Michael O'Keeffe, Bruce G. Hyde, Crystal Structures, Number 1: Patterns & Symmetry, page 350, This is based on a packing of 36-vertex icosahedra [5¹².6⁸] and enneahedra (4³.5⁶].